ABOUT THE PRODUCT
About TimeDateLab
TimeDateLab is a time and date calculator site with English and Simplified Chinese interfaces. It keeps calculation rules visible, processes inputs in the browser, and documents how results can be checked and repeated.
01Product
What TimeDateLab does
TimeDateLab provides focused time and date calculators. All follow explicit, deterministic calculation rules, and no account is required to use them.
Time Duration CalculatorCompare clock times or local date-times with the active counting rules visible.Open calculator →Day CounterCount calendar days between two dates with a weekday and weekend-day breakdown.Open calculator →Work Hours CalculatorCalculate one shift after an unpaid break, including an explicit overnight policy.Open calculator →Time Card CalculatorAggregate up to seven daily shifts and partition weekly time at an explicit overtime threshold.Open calculator →
02Principles
Product principles
- Clarity
- Counting rules stay visible.
- Local calculation
- Calculator inputs are processed in the browser.
- Reproducibility
- Methods, assumptions and limits are documented so calculations can be checked and repeated.
- Accessibility
- Core workflows are designed for keyboard, mobile and assistive technology.
03Scope
Current scope
- Time Duration Calculator
- Compares clock times and local date-times.It does not calculate timezone-aware real elapsed time across timezone or DST changes.
- Day Counter
- Counts calendar-day differences with a weekday and weekend-day breakdown.It does not subtract public holidays or apply regional or custom business calendars.
- Work Hours Calculator
- Calculates one shift after a whole-minute break deduction.It does not calculate weekly time cards, multiple shifts, pay, overtime, tax, or holidays.
- Time Card Calculator
- Aggregates up to seven daily shifts and partitions weekly Net Work Time at an explicit Overtime Threshold.It does not calculate pay, tax, legal overtime eligibility, employee records, or multiple shifts per day.
04References